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Ultra modern design meets reliable European aquarium heater technology. The Fluval M Series Heater is a welcomed departure from bulky unsightly heaters. This beautifully-designed aquarium heater features a reflective shock-resistant borosilicate glass tube that houses superior components including a computer calibrated thermostat-all backed by a 16 point quality assurance program. Easy-to-adjust temperature control dial allows temperature settings between 66-86° Fahrenheit. Elegant, slim-profile heater occupies less space and unique mirror-like surface reflects surrounding colors to blend harmoniously into the aquarium environment. The Fluval M Series Heater is safe for fresh and saltwater aquariums. Submersible to water line on heater.

Sleek design, looks amazing in tank. The blue light that indicates that it's heating is easy to see across the room, but it is not obnoxiously bright. Temperature dial is easy to read and easy to adjust.

Cons:

None

I bought the M100 for my ten gallon tank. It keeps it at a nice even temp and it was easy to successfully treat a bout of ick and then steadily lower the temp again without the big fluctuations that I got from the last heater I owned.